RECORDS OF IV. A. MUSEUM. 
[167 
a lens, nearly white ; actinal spines whitish, the largest ones with a 
faint broad band of purplish, near middle. 
Between Fremantle and Geraldton, W.A. One specimen, No. 
4937 - Type. 
This interesting new species is in many particulars like C. 
rotundus, A.Ag. from the west coast of Mexico and Central America, 
but there are some important differences. Chief of these is the 
position of the anus which in rotundus is rarely more than 3 mm. 
from the margin of the test. In rotundus, too, the poriferous areas 
of the petals are much wider in specimens of the same size ; thus 
in a specimen of rotundus of the size of the telurus above described, 
the poriferous area would be about 3 mm. wide, or nearly 5° U 
broader. The test is much more fragile and the margin is thinner 
in telurus than in rotundus. 
PERONELLA APHNOSTINA 1 sp. nov. 
Plate XXIV. 
Test somewhat elongated, abruptly narrowed posterior to 
middle, very flat, finely and evenly granulated ; length 137 mm.; 
greatest breadth, slightly anterior to mouth, 112 mm.; breadth 
equals less than .82 of length ; 15 mm. back of mouth, width 
is only 95 mm. and 30 mm. back of mouth it is only 88 mm. , 
at anus, it is 55 mm. Apex of test coincides with centre of 
madreporic body, 64 mm. from anterior margin of test. Mouth 
directly beneath apex. Apical-oral diameter, 13 mm. lest 
thinnest at margin where it is scarcely 3 mm. thick. Oral surface 
flat ; mouth scarcely at all sunken. Auricles fused into a single 
stout piece on each interambulacrum. Anal sysLem small, about 
4 mm. in diameter, its distal margin about 6 mm. from test margin , 
it is covered with small spine bearing plates. 
Petaloid area, about 72 mm. long and 68 mm. broad. Anterior 
or unpaired petal, 36 mm. long ; anterolateral, 32 mm. ; postero- 
lateral, 37 mm. Each petal is about 10 mm. wide. Unpaired petal 
broadly open (by 4.5 m'm.) ; paired petals open by about 3 mm. 
Madreporic body about 4 mm. across. Genital pores 4, there being 
none in posterior interradius. Primary spines 3-4 mm. long actin- 
1 Gr. -Aphno, of a sudden + sleino-to make narrow, in reference to the 
shape of the test. 
